US8087758B2 - Liquid droplet ejecting head and liquid droplet ejecting apparatus - Google Patents

Liquid droplet ejecting head and liquid droplet ejecting apparatus Download PDF

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Publication number
US8087758B2
US8087758B2 US11/899,201 US89920107A US8087758B2 US 8087758 B2 US8087758 B2 US 8087758B2 US 89920107 A US89920107 A US 89920107A US 8087758 B2 US8087758 B2 US 8087758B2
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US
United States
Prior art keywords
common flow
paths
droplet ejecting
liquid droplet
ejectors
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Expired - Fee Related, expires
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US11/899,201
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US20080143793A1 (en
Inventor
Masakazu Okuda
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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Assigned to FUJI XEROX CO., LTD. reassignment FUJI XEROX CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OKUDA, MASAKAZU
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14233—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/11—Embodiments of or processes related to ink-jet heads characterised by specific geometrical characteristics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/12—Embodiments of or processes related to ink-jet heads with ink circulating through the whole print head

Definitions

  • the present invention relates to a liquid droplet ejecting head and a liquid droplet ejecting apparatus, and in particular to an inkjet recording head and an inkjet recording apparatus that eject extremely small ink droplets with piezoelectric elements.
  • liquid droplet ejecting apparatus represented by inkjet printers
  • inkjet printers there has been a demand to achieve a balance between high image quality recording and high speed recording.
  • liquid droplet ejecting apparatus that can execute recording with high image quality even with respect to plain paper in which ink bleeding and show-through easily occur.
  • a so-called matrix type head has been proposed as a liquid droplet ejecting head suited for this.
  • the ejectors of the head are arranged two dimensionally, and each ejector is connected with a common channel as shown in FIG. 7 ., through which ink is supplied.
  • FIG. 7 shows ejectors of a conventional matrix type head 100 and the arrangement of a common channel 114 through which ink circulation is performed.
  • the ejectors 120 are arranged in a two dimensional matrix array.
  • the common channels 114 are arranged between sequences of ejectors and are connected at upstream and downstream ends to common flow path mainstreams 112 .
  • Each ejector 120 is connected to the common channel 114 via a communicating path 116 (ink feed path), and ink supply to the ejectors 120 from the common channel 114 is performed.
  • an ink circulation flow Q is created in the direction of the arrows from an upstream ejector 120 A to a downstream ejector 120 B.
  • a liquid droplet ejecting head that drives pressure generating portions disposed in pressure chambers inside ejectors to thereby pressurize liquid inside the pressure chambers and cause liquid droplets to be ejected from nozzles communicated with the pressure chambers, wherein the ejectors are connected at a plurality of places via a plurality of communicating paths to common flow paths in which forcible liquid flows are formed.
  • FIG. 1 is a flowchart showing the relationship between conventional problems and the present invention
  • FIGS. 2A and 2B are diagrams showing a liquid droplet ejecting head relating to a first exemplary embodiment of the present invention
  • FIG. 3 is a diagram showing liquid flows in the liquid droplet ejecting head relating to the first exemplary embodiment of the present invention
  • FIG. 4A is a diagram showing a connecting portion of the liquid droplet ejecting head relating to the first exemplary embodiment of the present invention
  • FIG. 4B is a diagram showing a connecting portion of a liquid droplet ejecting head relating to a second exemplary embodiment of the present invention.
  • FIG. 4C is a diagram showing a connecting portion of a liquid droplet ejecting head relating to a third exemplary embodiment of the present invention.
  • FIG. 5 is a diagram showing the cross section of a liquid droplet ejecting head relating to a fourth exemplary embodiment of the present invention.
  • FIG. 6 is a diagram showing the cross section of a liquid droplet ejecting head relating to a fifth exemplary embodiment of the present invention.
  • FIG. 7 is a diagram showing a conventional liquid droplet ejecting head.
  • FIG. 1 is a flowchart showing conventional problems and the effects of the present invention.
  • the flow path resistance in the common flow paths becomes larger because of the above-described two reasons (increasing the length of the common flow paths and raising the viscosity of the ink) (c).
  • the present invention devises a flow path structure to connect the ejectors to plural places of the common flow paths by plurally disposed communicating paths to thereby enable the occurrence of variations in the back pressure of the ejectors to be prevented (h) and image quality deterioration to be prevented.
  • FIGS. 2A and 2B there is shown a liquid droplet ejecting head 10 relating to a first exemplary embodiment of the present invention.
  • ejectors 20 are two-dimensionally arrayed in a matrix in the liquid droplet ejecting head 10 , common flow paths 14 A and 14 B whose liquid flow directions are different are alternately disposed between columns of the ejectors 20 , and ink is supplied to the common flow paths 14 A and 14 B from common flow path mainstreams 12 A and 12 B.
  • the common flow path mainstreams 12 A and 12 B supply ink to the common flow paths 14 A and 14 B, which supply ink to each of the ejectors 20 via first communicating paths 16 and second communicating paths 18 .
  • back pressure resulting from the liquid flows in opposite directions acts on the ejectors 20 from the first communicating paths 16 and the second communicating paths 18 .
  • the present embodiment is characterized in that the directions of the ink circulation flows are mutually different between the common flow paths 14 A and 14 B that are adjacent, and the two communicating paths 16 and 18 are disposed in each of the ejectors 20 so that the two communicating paths 16 and 18 are connected to the separate common flow paths 14 A and 14 B (common flow paths whose ink circulation flows are in opposite directions).
  • the common flow path mainstreams 12 A and 12 B are also respectively independent per circulation flow such that the directions of the ink circulation flows are opposite between the common flow paths 14 A and 14 B that are adjacent, and in FIG. 2A , one each of the common flow path mainstreams 12 A and 12 B is disposed for each of the common flow paths 14 A and 14 B.
  • the first communicating path 16 is connected to the downstream side (where back pressure is low) of the common flow path 14 A
  • the second communicating path 18 is connected to the upstream side (where back pressure is high) of the common flow path 14 B. Consequently, the back pressure acting on a pressure chamber of the ejector 20 A becomes equal to the average of pressures at two points (the place where the first communicating path 16 and the common flow path 14 A are interconnected and the place where the second communicating path 18 and the common flow path 14 B are interconnected).
  • the first communicating path 16 is connected to the upstream side (where back pressure is high) of the common flow path 14 A
  • the second communicating path 18 is connected to the downstream side (where back pressure is low) of the common flow path 14 B. Consequently, the back pressure acting on the pressure chamber of the ejector 20 B becomes equal to the average of pressures at two points (the place where the first communicating path 16 and the common flow path 14 A are interconnected and the place where the second communicating path 18 and the common flow path 14 B are interconnected), and this becomes equal to the back pressure acting on the pressure chamber of the ejector 20 A.
  • the back pressures acting on the pressure chambers of the ejectors 20 A and 20 B are equal to the average of pressures P 14 A and P 14 B of the common flow paths 14 A and 14 B, and as long as one of the common flow paths 14 A and 14 B has a high pressure on the upstream side, the other will have a low pressure on the downstream side, so the back pressure acting on the ejectors 20 , which is equal to the average of both of the pressures, becomes a constant value regardless of the places where the ejectors 20 are connected.
  • FIG. 3 there are shown ink flows that occur inside the ejectors 20 of the liquid droplet ejecting head 10 relating to the first exemplary embodiment of the present invention.
  • the ink By effectively utilizing these ink flows to cause the ink inside the pressure chambers 24 to always circulate, the ink can be refreshed, and it becomes possible to prevent the accumulation of increased-viscosity ink and changes (such as sedimentation of color material) in the nature of the ink inside the pressure chambers 24 . That is, there is the potential for ink whose solvent content has dropped to increase in viscosity due to ink staying inside the pressure chambers 24 for a long time or for the color material that had been dispersed within the ink to cause a change in the nature such as aggregation or sedimentation, but this situation can be avoided by causing the ink inside the pressure chambers 24 to always flow.
  • the ratio (R 2 /R 1 ) of a flow path resistance sum R 1 of the communicating paths 16 and 18 to a flow path resistance R 2 of the common flow paths 14 (portions between each of the ejectors 20 ) is preferable to set the ratio (R 2 /R 1 ) of a flow path resistance sum R 1 of the communicating paths 16 and 18 to a flow path resistance R 2 of the common flow paths 14 (portions between each of the ejectors 20 ) to be 10 times or greater and more preferably 1000 times or greater.
  • FIGS. 4A to 4C there are shown methods of connecting the ejectors 20 and the common flow paths 14 relating to the present invention.
  • the ejectors 20 (the pressure chambers 24 ) and the common flow paths 14 are interconnected via the communicating paths 16 and 18 that are groove-shaped ( FIG. 4A ), but the shape and form of the communicating paths 16 and 18 are not limited to this.
  • the communicating paths 16 and 18 may also be disposed as holes that are disposed in members separate from the ejectors 20 as in a second exemplary embodiment shown in FIG. 4B , or the ejectors 20 and the common flow paths 14 may be interconnected via hole-shaped communicating paths 16 and 18 that are disposed in both end portions of the ejectors 20 as in a third exemplary embodiment shown in FIG. 4C . That is, it is possible for the communicating paths 16 and 18 to employ any shape and form as long as they have a flow path shape with which the desired flow path resistance R 1 can be obtained.
  • the pressure chambers 24 of the ejectors 20 are disposed so as to bridge the two common flow paths 14 , and the pressure chambers 24 and the common flow paths 14 are interconnected via the hole-shaped communicating paths 16 and 18 .
  • FIG. 5 there is shown an ejector portion that is created by laminating plural metal plates in a liquid droplet ejecting head 10 relating to a fourth exemplary embodiment of the present invention.
  • the flow paths in the liquid droplet ejecting head 10 are formed by laminating and joining together plural plates in which holes have been punched by wet etching or the like.
  • a pressure plate 28 integrated with a piezoelectric element 26 is disposed on one wall surface of the pressure chamber 24 , and the piezoelectric element 26 is driven by a control signal from an unillustrated controller. When the piezoelectric element 26 vibrates, the pressure plate 28 integrated therewith also vibrates and pressurizes the ink inside the pressure chamber 24 .
  • the pressurized ink is ejected as ink droplets from the nozzle 22 .
  • the ink inside the pressure chamber 24 that is consumed thereby is replenished from the common flow paths 14 via the communicating paths 16 and 18 .
  • the pressure chamber 24 is connected to the common flow paths 14 via the communicating path 16 and the communicating path 18 as in FIG. 5 .
  • the communicating paths 16 are formed as holes and the communicating paths 18 are formed as grooves, but as mentioned earlier the shapes of the communicating paths 16 and 18 are not limited to these holes or grooves as long as the desired flow path resistance R 1 can be ensured.
  • the common flow path 14 A and the common flow path 14 B are connected to the common flow path mainstreams 12 such that the ink flows in opposite directions (see FIGS. 2A and 2B ), and an ink circulation flow is formed by a pathway such as the following, for example: common flow path 14 A ⁇ communicating path 16 ⁇ pressure chamber 24 ⁇ communicating path 18 ⁇ common flow path 14 B.
  • ink circulation flows in opposite directions in the common flow paths 14 that are adjacent and connecting each of the ejectors 20 to both of the common flow paths 14 while maintaining the refill characteristics of the ejectors 20 , it becomes possible to make the back pressure acting on each of the ejectors 20 substantially constant.
  • FIG. 6 there is shown a connected state of common flow paths and common flow path mainstreams in an ejector portion that is created by laminating plural metal plates in a liquid droplet ejecting head relating to a fifth exemplary embodiment of the present invention.
  • the flow path in the liquid droplet ejecting head 10 is the same as that of the fourth exemplary embodiment in that it is formed by laminating and joining together plural plates in which holes have been punched by wet etching or the like.
  • the common flow path mainstream 12 A and the common flow path mainstream 12 B whose flow directions are mutually different are formed inside the liquid droplet ejecting head 10 as a two-story structure and are connected via a common flow path communicating path 13 A or a common flow path communicating path 13 B to the common flow paths 14 disposed between the ejectors 20 .
  • the ink circulation flows inside the liquid droplet ejecting head 10 are generated by a pump (not shown) or the like disposed outside the liquid droplet ejecting head 10 .
  • the ink circulation flows may have a planar arrangement where they are arranged in the left-right direction in the drawing without having a two-story structure as in FIG. 6 .
  • the liquid droplet ejecting head relating to the present invention has a structure where ejectors are connected at plural places via plurally disposed communicating paths to common flow paths in which forcible liquid flows of liquid are formed, whereby the liquid droplet ejecting head can prevent the prevent the occurrence of variations in back pressure acting on the ejectors and can prevent image quality deterioration.
  • the present invention can be applied not only to a liquid droplet ejecting head that uses an electromechanical converter (specifically, piezo actuators and electrostatic actuators) but also to a liquid droplet ejecting head that uses other ejection principles such as a thermal method.
  • an electromechanical converter specifically, piezo actuators and electrostatic actuators
  • other ejection principles such as a thermal method.
  • the applied field of the present invention is not limited to inkjet printers, and it is also possible to apply the present invention to all types of liquid droplet ejecting apparatus including industrial use liquid droplet ejecting apparatus such as those used in color filter manufacturing and semiconductor manufacturing and various types of film forming apparatus. Particularly in industrial purposes, there are many needs to eject liquids of high viscosity, so it is possible to effectively utilize the present invention.
  • a liquid droplet ejecting head of a first aspect is characterized in that it is a liquid droplet ejecting head that drives pressure generating portions disposed in pressure chambers inside ejectors to thereby pressurize liquid inside the pressure chambers and cause liquid droplets to be ejected from nozzles communicated with the pressure chambers, wherein the ejectors are connected at a plurality of places via a plurality of communicating paths to common flow paths in which forcible liquid flows are formed.
  • the invention of this configuration has a configuration where the plural communicating paths are disposed in the ejectors and the ejectors are connected to plural points of the common flow paths via these communicating paths.
  • the back pressure acting on the ejectors becomes the pressure inside the common flow paths at the places where the ejectors are connected, so when the ejectors are connected to the common flow paths at plural points whose pressures are different, the average of the pressures at the connected places becomes the back pressure acting on the ejectors. Consequently, by connecting each of the ejectors to plural points of the common flow paths, the differences in back pressure between the ejectors can be reduced and the characteristics between the ejectors can be made uniform.
  • a liquid droplet ejecting head of a second aspect is characterized in that connection points between the communicating paths and the common flow paths are set such that average values of pressures inside the common flow paths at the plurality of places where the communicating paths and the common flow paths are interconnected become substantially the same between the plurality of ejectors disposed inside the liquid droplet ejecting head.
  • the back pressure can be made substantially equal in all of the ejectors connected to the common flow paths regardless of the positions where the ejectors are connected to the common flow paths, and it becomes possible to ensure high uniformity in the ejector characteristics.
  • a liquid droplet ejecting head of a third aspect is characterized in that the ejectors are two-dimensionally arranged along rows and columns, and the common flow paths are disposed per each of the rows and the columns.
  • the ejectors are two-dimensionally planarly arranged, so high resolution recording can be executed in one pass.
  • a liquid droplet ejecting head of a fourth aspect is characterized in that the ejectors are disposed between two of the common flow paths.
  • the communicating paths that supply liquid to the ejectors can be connected to the two common flow paths that are adjacent in a small space.
  • a liquid droplet ejecting head of a fifth aspect is characterized in that liquid flows in mutually opposite directions are formed in two of the common flow paths that are adjacent, and the ejectors are connected to the two adjacent common flow paths by at least two of the communicating paths.
  • the back pressure can be made substantially equal in all of the ejectors connected to the common flow paths regardless of the positions where the ejectors are connected to the common flow paths, and it becomes possible to ensure high uniformity in the ejector characteristics.
  • a liquid droplet ejecting head of a sixth aspect is characterized in that one of the communicating paths is disposed in an end close to an ejection surface of each of the pressure chambers, and another of the communicating paths is disposed in the other end of each of the pressure chambers.
  • the ink inside the pressure chambers is always refreshed, so it becomes possible to prevent an increase in the viscosity and changes in the nature of the ink inside the pressure chambers and to improve the reliability of the apparatus.
  • a liquid droplet ejecting head of a seventh aspect is characterized in that one of the communicating paths is disposed in an end close to the nozzle of each of the pressure chambers, and another of the communicating paths is disposed in the other end of each of the pressure chambers.
  • a liquid droplet ejecting head of an eighth aspect is characterized in that the ratio of the sum of the flow path resistances in the plural communicating paths to a flow path resistance in the common flow paths is set to be equal to or greater than 10 times.
  • a liquid droplet ejecting apparatus of a ninth aspect is characterized in that it is disposed with the liquid droplet ejecting head of any of the first, second, and fourth to eighth aspects.
  • a liquid droplet ejecting apparatus of a tenth aspect is characterized in that the ejectors are two-dimensionally arranged along rows and columns, and the common flow paths are disposed per each of the rows and the columns.
  • the ejectors are two-dimensionally planarly arranged, so high resolution recording can be executed in one pass.
  • the present invention is configured as described above, so variations in back pressure arising in each ejector in a matrix type liquid droplet ejecting head can be kept small and it becomes possible to realize a liquid droplet ejecting head and a liquid droplet ejecting apparatus that can ensure high characteristic uniformity between the ejectors and is capable of high quality recording.

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US11/899,201 2006-12-18 2007-09-05 Liquid droplet ejecting head and liquid droplet ejecting apparatus Expired - Fee Related US8087758B2 (en)

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JP2006-340217 2006-12-18
JP2006340217A JP4872649B2 (ja) 2006-12-18 2006-12-18 液滴吐出ヘッドおよび液滴吐出装置

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